Tolerância do Tifton 85 (Cynodon spp.) e da Brachiaria brizantha ao glyphosate

Santos, Maurinho Luiz dos; Ferreira, Francisco Affonso; Freitas, Francisco Cláudio Lopes de; Ikeda, Atsuo; Oliveira, Fabiana Lopes Ramos de; Rocha, Dalva Cassie; Lima, João Guilherme Araújo; Silva, F.N.A.; Assis, F.G.V.

doi:10.1590/s0100-83582008000200011

Cited by 11 publications

(21 citation statements)

References 9 publications

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“…These results indicate that B. brizantha showed greater sensitivity to fluazifop-p-butyl, when compared with Tifton 85 plants (Figures 1 and 2), in accordance with the studies of Santos et al (2006Santos et al ( , 2007Santos et al ( and 2008 who have reported increased tolerance of Tifton 85 to glyphosate. Smeda and Putnam (1990), and Friesen & Wall (1991) also observed fluazifopp-butyl herbicide susceptibility differences between grass species.…”

Section: Resultssupporting

confidence: 91%

“…When Santos et al, (2010) assessed the tolerance of Tifton 85 to glyphosate in two different application periods, they elucidated that plants exposed to this herbicide in cooler periods of the year (winter) have lower tolerance when compared with plants exposed to this herbicide in the summer. As reported by Santos et al (2006Santos et al ( , 2007Santos et al ( , 2008, Tifton 85 plants, in the summer, tend to have greater tolerance to glyphosate, possibly due to favorable conditions for growth and development, such as temperature and rooting, which may be related to the ease of metabolism, conjugation and, or, exudation of herbicides by plants, in addition to further development of starchy rhizomes, serving as reserves for regrowth of plants.…”

Section: Resultsmentioning

confidence: 73%

“…These are undesirable, due to their interference and multiplication, dominating the main forage in a short period of time (Santos et al, 2006(Santos et al, , 2007(Santos et al, , 2008.…”

Section: Introductionmentioning

confidence: 99%

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Brachiaria brizantha control by using fluazifop-p-butil on Tifton 85 pasture formation

Santos¹,

Ferreira²,

Freitas³

et al. 2012

R. Bras. Zootec.

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-This study was carried out with the aim of assessing the efficacy of the fluazifop-p-butyl herbicide to control Sixty days after application, plants were harvested at ground level and oven-dried. Regrowth was assessed in the same manner, 60 days after cutting, to determine their dry weight. Control of B. brizantha was noted to be above 50%, from doses of 218.75 g ha -1 at 45 days after application. The fluazifop-p-butylherbicide did not show to be efficient in the control of B. brizantha in the doses assessed and caused intoxication to Tifton 85 plants.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 73%

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Brachiaria brizantha control by using fluazifop-p-butil on Tifton 85 pasture formation

Santos¹,

Ferreira²,

Freitas³

et al. 2012

R. Bras. Zootec.

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“…Algumas espécies do gênero Cynodon possuem grande número de rizomas e estolões efetivos na propagação da espécie, o que dificulta a adoção de métodos mecânicos de controle e inviabiliza o uso de determinados herbicidas (Santos et al, 2008). O uso de produtos à base de glyphosate tem apresentado bons resultados em plantas jovens, porém relatos de tolerância de espécies do gênero Cynodon a esse herbicida são frequentes no campo.…”

Section: Introductionunclassified

“…Em trabalho com Cynodon dactylon, Johnson (1995) demonstrou que os cultivares Commom, Cheyenne, Tropica e Sahara têm suscetibilidades diferentes a um mesmo herbicida. Para alguns herbicidas recomendase a aplicação sequencial, realizada em plantas jovens e posteriormente em adultas (Santos, 2008), e repetida ao longo dos anos, para o controle de espécies como Cynodon dactylon (Grichar, 1995), sendo o glyphosate indicado para o seu controle.…”

Section: Introductionunclassified

Tolerância do Tifton 85 ao glyphosate em diferentes épocas de aplicação

Santos¹,

Freitas

Ferreira³

et al. 2010

Planta daninha

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RESUMO -O Tifton 85 é uma forrageira de alto valor nutritivo, recomendada para pastejo, fenação e silagem, podendo ser considerada uma espécie daninha, principalmente em áreas de cultivos agrícolas e produção de sementes de outras forrageiras, devido a sua fácil propagação e seu rápido desenvolvimento. Este experimento foi proposto com o objetivo de avaliar a tolerância de plantas de Tifton 85 a doses crescentes de glyphosate em duas épocas diferentes. O experimento foi conduzido em vasos de polietileno com capacidade de 10 L, em delineamento experimental de blocos casualizados, no esquema fatorial 2 x 8, sendo duas épocas de aplicação (inverno e verão) e oito doses de glyphosate (0, 270, 540, 1.080, 2.160, 3.240, 4.320 e 5.400 g ha), com quatro repetições. Para cada época de aplicação, o controle das plantas de Tifton 85 foi feito aos 15, 30 e 60 DAA (dias após aplicação). Obteve-se controle superior a 90% de Tifton 85 a partir de 2.636,72 g ha -1 de glyphosate em aplicação realizada no inverno e de 3.607,03 g ha -1 em aplicação no verão. Os resultados evidenciaram a alta tolerância do Tifton 85 ao glyphosate e o maior controle das plantas expostas a esse herbicida em épocas mais frias do ano (inverno), quando em comparação com as plantas expostas ao herbicida no verão.Palavras-chave: Cynodon spp., pastagem, planta daninha, forrageiras.ABSTRACT -Tifton 85 is a type of forage of high nutritive value, recommended for grazing or hay and silage production. It can be considered a weed, mainly in agricultural and forage seed production areas, probably due to its easy propagation and fast development. Thus, this experiment aimed to evaluate Tifton 85 tolerance to increasing levels of glyphosate during two different seasons. The experiment was arranged in a completely randomized block design with four replications in a 2 x 8 factorial arrangement, and pulverization in two seasons (winter and summer) and eight glyphosate levels (0; 270; 540; 1,080; 2,160; 3,240; 4,320; and 5,400 g ha -1 ). The experiment was carried out in polyethylene pots with 10L capacity. For each season, control of the Tifton 85 plants was performed at 15, 30 and 60 DAA (days after application). Around 90% of Tifton 85 plant control was observed with 2,636.72 g ha -1 of glyphosate in the winter and 3,607.03 g ha -1 of glyphosate in the summer. The results obtained showed that Tifton 85 is highly tolerant to glyphosate and control is more efficient in the winter than in the summer.

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Differential tolerance and selectivity of herbicides in forages of the genus Cynodon

2019

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Plant recovery due to herbicide symptoms of phytotoxicity characterizes an additional waste of energy that should not be accepted as a natural physiologic response; therefore, it might result in yield losses. Herbicide‐tolerant forages and the use of less phytotoxic products on pastures provide improvements in chemical weed control and increases in forage yield. The objectives of this study were to test differences between Tifton 85 (Cynodon spp.) and African star grass (Cynodon nlemfuensis) in relation to their degree of tolerance to herbicides, as well as the selectivity of herbicides for both species. The experimental design was completely randomized, in a 2 × 8 factorial, with four replicates. Two species of Cynodon and eight herbicide treatments were evaluated. The tolerance and selectivity of herbicides for Tifton 85 and African star grass are a function of each species and the type and dose of herbicide applied. Among the two species of Cynodon, Tifton 85, in general, was more tolerant to the applied herbicides than was the African star grass and consequently with less probability to occur forage yield losses. The most phytotoxic herbicides for both forages were fluroxypyr + aminopyralid (160.0 + 80.0 g ae/ha [grams of acid equivalent per hectare]), fluroxypyr + triclopyr (320.0 + 960.0 g ae/ha) and glyphosate (180 g ae/ha). The most selective herbicides were bentazon (720.0 g ai/ha [grams of active ingredient per hectare]), imazapyr (25.0 g ai/ha) and MSMA (1,440.0 g ai/ha), which have potential for use in fields of Tifton 85 and African star grass.

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Tolerância do Tifton 85 (Cynodon spp.) e da Brachiaria brizantha ao glyphosate

Cited by 11 publications

References 9 publications

Brachiaria brizantha control by using fluazifop-p-butil on Tifton 85 pasture formation

Brachiaria brizantha control by using fluazifop-p-butil on Tifton 85 pasture formation

Tolerância do Tifton 85 ao glyphosate em diferentes épocas de aplicação

Differential tolerance and selectivity of herbicides in forages of the genus Cynodon

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